. The endocrine organs; an introduction to the study of internal secretion . ecretion. For hypothyroidism, like hypopituitarism, raises the assimila-tion limit for sugar in the body. On the other hand, according to Asherand Flack, the presence of an unusual amount of thyroid secretion in theblood acts as an excitant to the suprarenals, causing an increased outpour-ing of adrenalin, and thus producing a lowering of the sugar assimilationlimit. As we have seen, a deficiency in thyroid secretion is associated withincrease of secretion of the posterior lobe of the pituitary. Gushing states that af
. The endocrine organs; an introduction to the study of internal secretion . ecretion. For hypothyroidism, like hypopituitarism, raises the assimila-tion limit for sugar in the body. On the other hand, according to Asherand Flack, the presence of an unusual amount of thyroid secretion in theblood acts as an excitant to the suprarenals, causing an increased outpour-ing of adrenalin, and thus producing a lowering of the sugar assimilationlimit. As we have seen, a deficiency in thyroid secretion is associated withincrease of secretion of the posterior lobe of the pituitary. Gushing states that after removal of the pancreas the amount ofhyaline substance of the pars intermedia and pars nervosa is increased. CHAPTER XVITHE PINEAL GLAND STRUCTURE OF THE PINEAL THE pineal gland or epiphysis cerebri (conarium), which is present innearly all vertebrates, is in man a small solid organ less than half the sizeof the pituitary body. It projects from the roof or dorsal wall of the thirdventricle (fig. 82, from the cat), and is connected on each side by a short stalk :\- ^-^. FIG. 82.—Sagittal section of pineal of cat. Magnified 50 diameters. I am indebted toDr Kojima for the specimen from which this microphotograph was taken. or peduncle to the habenular commissure. The base of the gland has asmall infundibular depression (pineal recess) leading from the ventriclejust above the entrance of the aqueduct. This recess is the remains of anevagination from the third ventricle, from which the pineal was originallydeveloped. In some reptiles a median eye is developed as a secondary out-growth from this evagination (Baldwin Spencer). The gland is proportion-ately larger in the child than in the adult, and in the female than in themale. Its average weight in man is 022 gramme. It lies between theanterior corpora quadrigemina, and is closely invested by pia mater, so 118 Structure of the Pineal 119 that it usually becomes detached from the brain if the pia mater istorn away.
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